Machine learning analysis of multispectral imaging and clinical risk factors to predict amputation wound healing.

OBJECTIVE: Prediction of amputation wound healing is challenging due to the multifactorial nature of critical limb ischemia and lack of objective assessment tools. Up to one-third of amputations require revision to a more proximal level within 1 year. We tested a novel wound imaging system to predict amputation wound healing at initial evaluation. METHODS: Patients planned to undergo amputation due to critical limb ischemia were prospectively enrolled. Clinicians evaluated the patients in traditional fashion, and all clinical decisions for amputation level were determined by the clinician's judgement. Multispectral images of the lower extremity were obtained preoperatively using a novel wound imaging system. Clinicians were blinded to the machine analysis. A standardized wound healing assessment was performed on postoperative day 30 by physical exam to determine whether the amputation site achieved complete healing. If operative revision or higher level of amputation was required, this was undertaken based solely upon the provider's clinical judgement. A machine learning algorithm combining the multispectral imaging data with patient clinical risk factors was trained and tested using cross-validation to measure the wound imaging system's accuracy of predicting amputation wound healing. RESULTS: A total of 22 patients undergoing 25 amputations (10 toe, five transmetatarsal, eight below-knee, and two above-knee amputations) were enrolled. Eleven amputations (44%) were non-healing after 30 days. The machine learning algorithm had 91% sensitivity and 86% specificity for prediction of non-healing amputation sites (area under curve, 0.89). CONCLUSIONS: This pilot study suggests that a machine learning algorithm combining multispectral wound imaging with patient clinical risk factors may improve prediction of amputation wound healing and therefore decrease the need for reoperation and incidence of delayed healing. We propose that this, in turn, may offer significant cost savings to the patient and health system in addition to decreasing length of stay for patients.

A Standardized Approach to Evaluating Lower Extremity Chronic Wounds Using a Checklist.

As the population ages and more people live with diabetes, obesity, and vascular disease, chronic wounds have become more prevalent. Increasingly, wound care falls into the hands of clinicians who may be new to the specialty. To facilitate a better understanding of wounds and to ensure all integral items for best outcomes are considered, an interprofessional panel of wound care experts developed a checklist to aid in lower extremity wound identification, assessment, evaluation, and potential complication recognition. This checklist focuses on an evidence-based approach to obtaining a medical history, evaluating the wound, determining the etiology, and assessing perfusion, edema, infection, and neurologic status. The goal of this fundamental evaluation tool is to help the clinician move towards the next steps in optimizing patient care. Evidence-based support for each item on the checklist is reviewed and detailed for clinician reference.

Inpatient and Outpatient Wound Treatment Recommendations: Assessing Use of Negative Pressure Wound Therapy Systems or Oxidized Regenerated Cellulose (ORC)/ Collagen/Silver-ORC Dressings.

The increase in wound prevalence means more patients with wounds are being transferred through care settings than ever before. Although the goals of therapy may be the same in both settings, wound care therapies and dressings differ in availability and appropriateness for each setting. Negative pressure wound therapy (NPWT) modalities and oxidized regenerated cellulose (ORC)/collagen (C)/silver-ORC dressings are available in both inpatient and outpatient care settings, but (to-date) lack comprehensive information regarding best practices in transitioning use of these therapies between various care settings. A panel meeting was convened to provide literature- and experience-based recommendations in transitioning wound care patients between various care settings. The use of NPWT with instillation and dwell time was recommended in wounds contaminated with debris and/or infectious materials or heavy exudate. In addition, ORC/C/silver-ORC dressing application was recommended for surface bleeding and for placement into explored areas of undermining to help promote development of granulation tissue. When transitioning a patient from inpatient to outpatient care, overall health, access to services, severity and complexity of the wound, and equipment availability should be taken into consideration. Treatment modalities to bridge the gap during care transition should be used to help maintain continuous care. For outpatient care, NPWT use was recommended for removal of infectious materials and exudate management. The ORC/C/silver-ORC dressings also may be used to help manage exudate and promote granulation tissue development and moist wound healing. In addition, practice challenges and potential solutions for patient adherence, interrupted care during patient transition, and troubleshooting after hours and weekend device alarms were discussed.

Use of a Novel Foam Dressing With Negative Pressure Wound Therapy and Instillation: Recommendations and Clinical Experience.

A new reticulated open-cell foam dressing with through holes (ROCF-CC) has been introduced to assist with wound cleansing by removing thick wound exudate and infectious materials during neg- ative pressure wound therapy with instillation. Due to the limited published evidence supporting use of ROCF-CC dressings with negative pressure wound therapy with instillation and dwell time (NPWTi-d), clinicians have been relying on practical application experience to gain pro ciency with the dressing and NPWTi-d. To help provide general guidelines for safe and e cient use of ROCF-CC dressings with NPWTi-d, a multidisciplinary expert panel of clinicians was convened from September 28 to 29, 2017. Principal aims of the meeting were to develop recommendations based on panel members' experience and lim- ited published results for use of ROCF-CC dressings, appropriate wound and patient characteristics for use, application settings, and clinical techniques to optimize outcomes. An algorithm to guide use of ROCF-CC dressings with NPWTi-d was also created. Panelists recommended the following goals for using ROCF-CC dressings: cleanse wounds when areas of slough or nonviable tissue remain on the wound surface, remove thick exudate, remove infectious materials, promote granulation tissue formation, and help provide a bridge to a de ned endpoint. Negative pressure wound therapy with instillation and dwell time with ROCF-CC dressings may be an appropriate adjunct therapy for wound cleansing, especially in cases when sharp excisional debridement is not available or appropriate. All panel members agreed that controlled clinical and scienti c studies of NPWTi-d with ROCF-CC are needed to further elucidate best practices and e ectiveness in various wound types.

Oxidized Regenerated Cellulose/Collagen Dressings: Review of Evidence and Recommendations.

OBJECTIVE: Healthcare systems are being challenged to manage increasing numbers of nonhealing wounds. Wound dressings are one of the first lines of defense in wound management, and numerous options exist. The oxidized regenerated cellulose (ORC)/collagen dressing may offer healthcare providers a robust and cost-effective tool for use in a variety of wounds. DESIGN: A multidisciplinary panel meeting was convened to discuss the use of ORC/collagen dressings in wound care and provide practice recommendations. A literature search was conducted to provide a brief review of the peer-reviewed studies published between January 2000 and March 2016 to inform the meeting. SETTING: A 2-day panel meeting convened in February 2017. PARTICIPANTS: Healthcare providers with experience using ORC/collagen dressings. This multidisciplinary panel of 15 experts in wound healing included podiatrists, wound care specialists (doctors, certified wound care nurses, and research scientists), and an orthopedist. RESULTS: The literature search identified 58 articles, a majority of which were low levels of evidence (69.3% were level 3 or lower). Panel members identified wound types, such as abrasions, burns, stalled wounds, diabetic foot ulcers, and pressure injuries, where ORC/collagen dressing use could be beneficial. Panel members then provided recommendations and technical pearls for the use of ORC/collagen dressings in practice. Barriers to ORC/collagen dressing use were discussed, and potential resolutions were offered. CONCLUSIONS: An ORC/collagen dressing can be a critical tool for clinicians to help manage a variety of wounds. Clinical and economic studies comparing standard-of-care dressings and plain collagen dressings to ORC/collagen dressings are needed.

Gentian Violet and Methylene Blue Polyvinyl Alcohol Foam Antibacterial Dressing as a Viable Form of Autolytic Debridement in the Wound Bed.

The objective of this article is to describe the results of a comparative porcine study that evaluated the effectiveness of a gentian violet and methylene blue (GV/MB) polyvinyl alcohol (PVA) antibacterial foam dressing in debriding eschar. The authors performed an in vivo, preclinical study on eschar-covered porcine wounds. Two clinical case studies are also included. Test products, GV/MB antibacterial foam dressing, collagenase ointment, collagenase ointment plus GV/MB antibacterial foam dressing, medical-grade honey, and moist gauze dressing (control), were applied to porcine wounds using a split-back study design. The percent of eschar removal and wound closure were measured and recorded at time points up to 14 days. Statistically significant reduction in eschar was observed with GV/MB dressing and with GV/MB dressing with collagenase. By day 14, the wounds with GV/MB dressing alone and GV/MB dressing with collagenase had eschar covering less than 25% of the wound bed area compared with collagenase alone, medical grade honey, or moist gauze control, which showed eschar still covering over 75% of the wound bed area. Autolytic debridement activity of GV/MB foam dressings was evident in the porcine eschar study, as well as in the cases described.

The management of diabetic foot ulcers through optimal off-loading: building consensus guidelines and practical recommendations to improve outcomes.

BACKGROUND: We sought to develop a consensus statement for the use of off-loading in the management of diabetic foot ulcers (DFUs). METHODS: A literature search of PubMed for evidence regarding off-loading of DFUs was initially conducted, followed by a meeting of authors on March 15, 2013, in Philadelphia, Pennsylvania, to draft consensus statements and recommendations using the GRADE (Grading of Recommendations Assessment, Development, and Evaluation) approach to assess quality of evidence and develop strength of recommendations for each consensus statement. RESULTS: Evidence is clear that adequate off-loading increases the likelihood of DFU healing and that increased clinician use of effective off-loading is necessary. Recommendations are included to guide clinicians on the optimal use of off-loading based on an initial comprehensive patient/wound assessment and the necessity to improve patient adherence with off-loading devices. CONCLUSIONS: The likelihood of DFU healing is increased with off-loading adherence, and, current evidence favors the use of nonremovable casts or fixed ankle walking braces as optimum off-loading modalities. There currently exists a gap between what the evidence supports regarding the efficacy of DFU off-loading and what is performed in clinical practice despite expert consensus on the standard of care.